The fibrous form of the mineral silicates belonging to the serpentine and amphibole groups of rock-forming minerals and includes: (a) actinolite, amosite (brown asbestos), anthophyllite, crocidolite (blue asbestos), chrysotile (white asbestos), tremolite; and (b) any mixture containing one or more of the minerals mentioned in paragraph (a). Asbestos fibre: a fibre of asbestos having: (a) a diameter of less than 3m;134 and (b) a length more than 5m; and (c) a length to diameter ratio of more than 3:1. Asbestos materials: installed thermal or acoustic insulation materials comprising or containing asbestos. Asbestos product: Anything that contains asbestos. Asbestos removal area:?an area where an asbestos removalist is performing, or proposes to perform, asbestos removal work. Asbestos removal site: an area immediately outside a containment barrier for an asbestos removal area. Asbestos removal work: work to remove asbestos materials other than work to remove asbestos materials that is done entirely in a containment device